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TRANSCRIPT
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FAILURE INVESTIGATON AND
ASSESSMENT OF
LIFTING EQUIPMENT
4th November 2015
Reported by Goh Zhu Di, Lim Kie Yong and Dr David Y H Tay
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CONTENT
Chapter 1 Introduction
Chapter 2 Forensic Engineering Investigation
Chapter 3 Analytical Methods Used in Forensic Investigation
Chapter 4 Crane Accidents and Failures
Chapter 5 Case Study 1
Chapter 6 Case Study 2
Chapter 7 Conditions assessment of Mobile Crane
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Chapter 1
Introduction
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Matcor Technology & Services Pte Ltd
Based in Singapore
Independent consultancy company in Materials and Corrosion for 25 years
Support Asia Pacific, North America, Africa and Europe
Specializes in the following areas:
Forensic investigations
Condition and metallurgical assessment
Structural integrity assessment
Remaining life assessment
Failure Analysis
In-House Laboratory Testing
INTRODUCTION
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INTRODUCTION
Experience in forensic engineering and equipment life assessment
Specializes in technical and life assessment of statutory equipment for
extensions
Provides consultation services for application of corporate level approvals
(CLA) with Ministry of Manpower, Singapore.
Speaker for the Aerospace Technology Seminar in 2013 organized by
AELD and RSAF
Speaker for the Crane Safety Symposium in 2014 organized by WSH and
Ministry of Manpower
Judy Goh - Consultant
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Chapter 2
Forensic Engineering Investigation
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FORENSIC ENGINEERING INVESTIGATION
Systematic and scientific investigation of a
failed system or component to establish the
primary mode and root cause of failures
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Engage consultant for investigation due
to an incident or accident
Conduct site investigations
Deploy specialist disciplines
Carry out laboratory test and analysis
Carry out NDT Research
Ascertain root cause
Report
Documentation and photo taking
Sketches and drawing reviews
Investigation and interviews
Gathering evidence
FORENSIC ENGINEERING INVESTIGATION
Litigation
Technical Witness
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Chapter 3
Analytical Methods Used in
Forensic Investigation
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- Data Collection and Review of Background Information
- Preliminary Evaluation
- Visual and Macroscopic Examination
(Sometimes aided with NDT)
- Application of Techniques
(Fractography, Energy Dispersive X-ray (EDX) analysis, Metallographic, Hardness Test and Other Relevant Tests)
- Overall Evaluation and Proper Interpretation of Test Results and
Available Background Information
ANALYTICAL METHODS USED IN
INVESTIGATION
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Chapter 4
Crane Accidents and Failures
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CRANE ACCIDENTS AND FAILURES
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CRANE ACCIDENTS AND FAILURES
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Chapter 5
Case Study 1
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CASE STUDY 1
Detachment of Superstructure of Mobile Crane
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CASE STUDY 1
Detachment of Superstructure of Mobile Crane
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CASE STUDY 1
Detachment of Superstructure of Mobile Crane
Fatigue A Combination of Fatigue & Overload
Overload
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CASE STUDY 1
Detachment of Superstructure of Mobile Crane
Lifting history: Frequent overloading lifting operations beyond capacity
Latest lifting operation was found to be carrying load beyond capacity
Pre-existing fatigue failures in almost half of the number of bolts
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Chapter 6
Case Study 2
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CASE STUDY 2
Broken Boom Hoist Wire Rope From A
Crawler Tower Crane
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CASE STUDY 2
Broken Boom Hoist Wire Rope From A
Crawler Tower Crane
Wound up
hoisting wire
rope
One fracture end of boom
hoist wire rope near the
moving bridle
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CASE STUDY 2
Broken Boom Hoist Wire Rope From A
Crawler Tower Crane
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CASE STUDY 2
Broken Boom Hoist Wire Rope From A
Crawler Tower Crane
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CASE STUDY 2
Broken Boom Hoist Wire Rope From A
Crawler Tower Crane
Mode of Failure: General corrosion and corrosion fatigue over time in
service
Root Cause: Inadequate greasing and poor maintenance of wire ropes
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Chapter 7
Condition Assessment of
Mobile Crane
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CONDITION ASSESSMENT OF MOBILE
CRANES
- Review operational and maintenance records
- Risk assessment and development of inspection
plan
- Inspection with the aid of NDT
- Overall review and evaluation of the crane
condition
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CONDITION ASSESSMENT OF MOBILE
CRANES
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Thank You